Edit: Close enough, dragonwriter. I yield the point. (I should have known about this. Also, why is there such a lack of optimized pad sized apps for Android? The phone ones I've seen weren't exactly using the screen area well.)
There's a phone version for Android 4.0+, but not yet a tablet version.
Interestingly, Google has all its products out for the desktop version on Windows 8.
Comparing Windows 8.x's desktop marketshare with Windows Phone's mobile marketshare might give a clue as to the reason why Google has apps for the former but not the latter.
Some might call it Microsoft reaping what they have sown for years and I've even heard people applaud Google for shutting out Microsoft, but when MS is putting tons of apps on the Android store and Google is blocking Microsoft from even getting to their website, from a user standpoint I have to be pissed at Google regardless of what Microsoft has done. It's petty, it's anti-consumer just like mid-90's Microsoft, and it's certainly not "do no evil".
[1] http://mashable.com/2013/01/05/google-maps-windows-phone/
I suspect because Android has had significant smartphone marketshare for longer and only comparatively recently bumped over iOS in tablet marketshare, so developers targetting Android have been largely targetting it for phone apps. Fragmentation and demographics probably still make iOS much more lucrative for tablet apps (as it still is, AFAIK, for smartphone apps), but the marketshare numbers are such that the lack of tablet apps for Android should start resolving itself, the same way the lack of phone apps did.
A large part of the Android tablets sold are low end models with bad screens, used for Point of Sale (in taxis etc) or minimal web browsing. Not generally used much per day. (Afaik, statistics for web site access generally support that.)