I like that there is less of a margin in power between a "First Born" marine and Primaris. This will open up the flexibility of the army composition. Scuttlebutt is that Basic marines will be bumped up to 18pts. So you can save a little bit in points, but have access to heavy weapons; or you can take Intercessors for two points more and get a better basic rifle and an extra attack.
I am absolutely ok with these changes, especially the increase in wound for Terminators. Three wounds will actually make them survivable now, and I expect their point value to increase back to what it has traditionally been (around 40pts for Storm Bolter and Power Fist). If the increase in wounds is going to apply to all First Born, having three wound bikers and 5 wound Attack Bikes is going to make me seriously reconsider how I build a Ravenwing list.