My guess is sundials are getting toned down (like phase dragons got immaterialized last update) and several of our favorite cards are going to get more expensive (I'm thinking otyugh's might go up a quantum, steal goes up a quantum or two, others?).
I would also like to see some upgrades to the AI, it could definitely benefit from some better strategy, such as its propensity to deck out with decks containing hourglasses and sundials, or its slavish reliance on creature damage to determine the greatest threat (especially with rewind/reverse time - frequently reverses a cheap creature when a much more expensive and important creature would be a better option). Perhaps also a better method for choosing which permanents to attack.
Finally, I'd like to see some tweaks made to the decks in AI 3 and FGs. Basically just more decks, plz. Why not a mono-aether or fire? There's tons of concepts out there, just in here on this board, for goodness sakes. Use em!