It seems likely that Google will announce Android 4.4 KitKat sometime soon, and possibly even this month. For the most part we expect them to launch it at the same time as the LG Nexus 5 which has been rumored for months. That doesn't mean that will be the only thing Google announces at that time. We have also heard a few rumors about an Asus-made Google Nexus 10 tablet coming, although intel for that has been quiet... until today. Supposedly the newest rumor is that the next Nexus 10 device will indeed be made by Asus instead of Samsung, and that it is due to come soon.
A screenshot of an Asus Nexus 10 tablet from Google in a retailer database was just leaked yesterday. We can share no other info other than the Tweet above, but we will keep our ears to the ground.