Google is a business, and in business you come first.
There's no way Google will give out Motorola's patents to HTC or Samsung.

Google will continue selling Google phones as Motorolas and avoid the big disputes with Microsoft and Apple, whereas the rest will be mauled by lawsuits and loyalties to Apple, Microsoft, Nokia and Motorola.

The other thing could be Google also buys patents/loyalties off the other companies. Then Google sells Android to HTC, Samsung, Sony, LG, Dell, Acer, ASUS, etc to have the "with Google" endorsment.
And that endorsement offers Android, Google's proprietary applications, protection from lawsuits ... so basically all those royalties (~$10 a device) HTC sells would not go to Microsoft but it'll goto Google's pocket.
This second move gives Google a better public image, so it seems to be the more likely scenario.