I hope this G4 "rumor" turns out to be true, although I'm surprised we've heard nothing about a film going into production to this point. It'll be nice to have the big turtle back after a brief absence, and nice to have some kaiju films to look forward to during Godzilla's hiatus.
As for who should direct, let's try to keep our minds open. Kaneko would do a fine job, as he has in the past, but he isn't the only director out there who could handle the assignment. If you hated GFW (or are just assuming you'll hate it, based on what others say

), that still doesn't mean that getting a new director for Gamera automatically means a turn for the worse. Kitamura is one guy with one vision for a kaiju film - there are a lot of directors and aspiring directors in Japan who undoubtedly have a different idea of how such films should be handled. Personally, I loved GFW and wouldn't mind that approach to GAMERA 4, just to shake things up. But I'll be happy with a straightforward continuation of the Heisei Gamera trilogy, too.
One thing that I fear is certain - because of the reverence (deserved or undeserved) for G3, there will be some in the fan community who, no matter how good it is, will be disappointed with G4.