After entering a large number of the units from RS:3145u into SSW, I've noticed a few trends regarding design philosophy in the early to mid 32nd century. I haven't had time to gather any sort of statistics so this is far from scientific. As with any trend, there will be plenty of contrary examples (or I may have simply misinterpreted what I was seeing). Feel free to add to or refute any of the following. NTNU is omitted, as it stands as a deliberate attempt to use new tech on old chassis.
1. Endosteel - It's pretty much ubiquitous now. There was a little endo-composite too, but almost every design I saw uses it.
2. Newer Missile systems - They're everywhere. I thought I saw more MML-5 and ATM-6 more than other sizes, but I feel like overall they are certainly supplanting SRMs (Streaks excluded). The Kuritans seem to be swimming against the stream on this one (especially with their high volume of Clan LRMs and MRM + Apollo)... also... is anyone else terrified by the rapid proliferation of Streak LRMs?
3. XL engines - Lots and lots of XL engines. Holy crap, there are a lot of XL and XXL engines.
4. IJJs - The IJJ craze in TRO 3085 appears to be mostly over
5. PPCs - The PPC craze is not over. Universe needs more Blue Shield.
6. Heavy Lasers - IS Clans love them some heavy lasers.
7. Shutting Down... - More TSEMP than I expected.
7. Attack of the sequels - Anubis, Atlas III, Black Hawk (standard), Black Knight, Catapult II, Centurion Omni, Dragon II, DA Firestarter, Hollander III, Kodiak II, Koshi (Standard), Loki II, Lu Wei Bing, Mad Cat IV, Phoenix Hawk L, Stalker II, Stalking Spider II, Templar III, Thor II, Viking IIC, Vulture III, IV, Zeus X