Also, bear in mind that the WOTC folks are not just playing with the core books that have gone to the printers, but are also developing and playtesting future products. There's never been any doubt that future PH or setting sourcebooks would include a full (PHB-style rather than MM-style) gnome racial write-up, and I'd be surprised if at least a draft version of this isn't floating around the designer/developer circles there.
Of course, Keith isn't a WOTC employee. But he's not exactly a typical playtester, either ... Gnomes are an integral part of the Eberron setting, and if he's being asked for any input to the 4E conversion of that setting (and he'd better be!), he may well have access to some of the pieces in development for that setting.