Been talking this afternoon to a
GW staffer and managed to wheedle some info from him about the rule changes.
1. Defensive weapons on vehicles will NOT be S4. To avoid nerfing Leman Russ', Pred Destructors, Chimeras etc. it will be at least S5.
2. Objectives can only be claimed by units which are Troops AND Infantry as was rumoured BUT they are re-classifying bikes, jetbikes, rough riders etc as mounted infantry! So if you have a Ravenwing, BSATW
SM or Eldar army that can have bikes as troops, these can claim objectives.
Disclaimer - I have absolutely no proof of this! I suppose the guy could have been yanking my chain but it sounds reasonable.
Not to mention if I find out this was a wind up my source wil be taken seriously ill......