Well, I spent years a long time ago on Weight Weenies figuring out how to lighten a bike. I remember sitting in meetings calculating the cost per gram for lower weight. Sometimes I went too far when a handlebar broke, but by and large it worked and I got down to a 15 pound bike not bad for an old Trek 5900 to get to the UCI weight limit of 6.8Kg.
Now with the latest offering, I haven't weighted it, but feels much heavier than that Trek, so on to figuring out how to make it more reasonable;

• The new bike has disc brakes so that is a one pound penalty right there typically although I'm having trouble finding numbers, it's a little hard to find how much a groupset weighs, but for Dura-Ace, they had a very similar weight for years. The 9000 was 2101 grams (with cable), 9070 with Di2 (2080g) while 90, the newest versions the 9100 is 2097g and the 9150 Di2 is 2051g. The disc brake versions 9120 adds 348 grams for mechanical while the 9170 adds 338 grams. So this is adding 12 ounces to the build. I can't regret this as it is about safety.
• The newer bike uses Ultegra 11 while the older one is Campagnolo Record 10 (yes I know I splurged!). At least for the older Dura Ace 9000 vs Ultegra 6800, there is a 296 gram difference or another 10 ounces which is way more than I would have thought. Also the Campagnolo Record at least a few years ago was super light, about  24 grams less that Dura-Ace, so call it an 11 ounce difference. Going back of the years, you can add up the groupset from Sheldon Brown as I can't find it online. While expensive, losing 11 ounces is actually a pretty big deal.
• The pedals are SpeedPlay X/1 Titaniums are an amazing 150 grams for a pair! Now the cleats themselves are lots heavier, but the PowerTap P1 weigh 429 grams, so that's a huge different right there of 279 grams or half a pound. But on the other hand, knowing the power is so important to training and they are simple to remove if you want.
• The wheelset before used Topolino wheelset with 23mm tires while the new one is ENVE with DT Swiss 240 and 25 mm tires. I used ultralight 180 gram Veloflux Pavelights and eyeballing it the 25mm tires are more like 225 grams , so call it an extra 90 grams just for the tires. And the Topolinos I got because they were just 1390 grams. Now the ENVE 3.4 with DT240 are amazing strong and weight just 1492 so about 102 grams more. For a total of 192 grams 6.8 ounces. Can't really regret this as the Topolino wheels were great, but definitely not a rigid as the ENVEs.
• The Dogma F8 Disc frameset weighs in at 798 grams while the Trek OCLV 110 was 1030 grams. That's actually a gain of 232 grams.
• The fork on the Trek is 345 grams while the F8 ONDA 2 fork is 400 grams so that's 55 grams heavier

The net is the new bike is going to weight more although it is far stiffer and faster (I'm getting about 1-2mph more speed out of the thing) but to add it all up: 338+320+279+192-232+55=952 grams about 2.1 pounds. That means even if all the components are equal, this will be a 17 pound vs 15 pound bike.
But we are probably over that, so here are some places to make equipment changes:

• The saddle on the Trek is a Fizik Aliante 2003 with Carbon rails so it is 175 grams while the newer Dogma has a Fizik Aliante 8 coming in a 275 grams. I also have an incredibly light but uncomfortable Selle Italia SLR which is 120 grams not counting the electrical tape you need on the side because the leather is so thin it will wear through. A simple fix to gain 100 grams is using the Outdoor Gear Labs recommendation and getting a Fabric Scoop Carbon Flat Pro Flat which is 176 grams. If you spend an additional $100, you get this down 10 grams (which isn't really worth it). • Stem. I remember lusting after this stem, it was one of the first carbon fiber stems. Made by Time called the Monolink Pro, it is 130 grams while the Dogma has a MOST TigerALU ST which is the internal brand for Pinarello and is 160 grams. For$80, you can get the MOST Tiger Ultra 3K which is 130 grams or for $160 there is the MOST Tiger Ultra 1K which is 100 gram (wow!) stem. • Skewers, these were really nerdy, but I did get the Salsa Titanium skewers at 91 grams for the Trek and for the ENVE has titanium skewers so probably about the same weight, but I really should get bolt on skewers to prevent them from moving around which are$44 at Bikeparts and 47 grams since they don't have the quick release mechanism. As an aside, another option is the DT Swiss RWS Thru Axle, this uses a 12mm hollow tube, so theoretically stronger than a simple titanium skewers, it weighs just 54 grams but is \$43 at JensenUSA for each axle so roughly twice the price of the Control Tech but is supposed to have better clamping force than quick release and is easier to manage than the lock nut system because it has a simple lever and is the best of both worlds in that sense.

Doing all this removes 100+70+45=215 grams or nearly 7 ounces. Wow, I'm a weight weenie, but it does get closer to that 17 pound mark.