The all X approach isn't as effective I've heard in TA since they adjusted the loss ratio from focus.
While focus used to cost 25% and transfer 25%, it now costs 25% and transfers 20% (transfers 80% of what it costs, if you prefer).
Additionally, the increased maintenance on buildings in TA magnifies focus's actual cost.
With that said, if you know what you're doing, it's still preferable to do all-x.
On the flip side, the economy is MUCH tighter in TA than in DL/DA due to maintenance costs and such.
You also start with somewhat less cash initially.
Oh, and the tech capital is harder to get to now, if that's relevant-but perhaps more to the point in TA it now provides only a bonus to base research on the planet in question; racial bonuses are not applied to it.
The simple answer to your other question is that GC3 has not yet been announced, is due some time after Elemental, which is due to be released on February 15 of 2010 (but may be pushed back), and more relevantly, GC3's engine will be based on Elemental's, or so we are told, with the economic functions thereof being of specific interest.