All we got from this roadmap was a nerf to assault riflescough hemlock with sledgehammercough some reskins of the same hit the road quest, and a new quest line that is just more fetch quests.
You are forgetting the new Heroes, Weapons Sets, Traps, etc.
The changes that are being done to add in the SMG weapon type shouldn't have any impact on your builds. From the roadmap, " SMGs will work with a mixture of existing assault rifle and pistol Hero Perks ", will remain true. You will still be able to run your full assault rifle builds as the perks also buff SMGs and I would definitely encourage you to hop in and test them out before assuming they are nerfs.
We'll keep an eye on the feedback from the upcoming changes and make adjustments as necessary.