My guess: To cut off the constant munchkining of the two that people kept doing, and to keep things simple and easy to get into.
Trolls are slow? That's weird. Movement is much nicer now, by the way. No complicated splitting over Passes, you got a Walk allotment, a Running allotment and can generate a Sprinting allotment. On top of that, Running now has more value because it determines how many IPs you can Sprint.
I'm confused by the whole "can't do another attack action" rule. Does that mean Singleshot weapons are limited to once per Combat Turn while Semi-Automatic can fire once per Action Phase?
Meanwhile, Complex Action FA/Burst Fire indeed accumulates recoil over multiple IPs, as someone reported before from PAX East. On top of that, you can use them as Simple Action to basically do the Short/Long Burst effects from SR4. Since you can't fire them a second time that Action Phase, no cumulative recoil.
I'm not gonna draw the other conclusions here yet, but it seems like they brought everyone except Magicians back to 1 attack per IP, while a Magician will find it to hurt like hell to do 2 attacks, what with Force as Drain base value and +3 Drain for Reckless Spellcasting. (This is based on other information, not Preview #4)
