Compared to the old rules (v1.5) I'd expect changes to ss cost certainly (likely things going up in ss cost). Things that were relatively cheap before will still likely be relatively cheap, and similarly for things that were expensive before. I'd expect that models that worked well with Dreamer before will still work well with him in M2e, and you might find that a few models that he wouldn't consider before might have new synergies with him in M2e. We'll see Open Beta rules for him and his crew in early October, so not far now.
As to the new models, we haven't been given any sort of release info. Given that his rules aren't even finalized until January or whenever Wave2 Arsenal packs are released, I wouldn't plan to see his new plastics until 2014 (sometime) and depending on the release schedule maybe even 2015.