IMHO 4e has some big dealbreakers show up of recent.
My group's host and his best friend are soured on 3e. Host's best friend is generally sick with 3e and seems to liked the look of 4e. Might not work out since our Host really prefers systems where characters avoid hits rather than have the HP to absorb hits and basically loathes the D&D way of grind through the foes HP.
He prefers:
Hit, Parry, Hit, Parry, Hit, Parry, Hit, failed to parry & take horrid wound and possibly drop.
D&D is
Hit, lose HP, Hit, lose HP, Hit, lose HP, Hit, lose HP then drop.
Another semi regular player is anti 4E due to not wanting to learn another system and does not want to have to buy another book.
So our group may stick with WFRP.