The Evo goes EOL very soon like in days. (EOL stands for End of Line) so it's very much of a doubt. See how long it took for our Gingerbread upgrade? Yeah...and with Sprint, they usually only let Android devices upgrade twice then they don't allow more upgrades cause they want us to buy a brand new phone like the Evo 3D or iPhone 4S. Sucks for us cause most of us are waiting for something that was as big as the Evo on launch.
As ocnbrze said, we'll get it most likely through our rooting devs.
There's no way that HTC will get it to the Evo. I had the HTC Hero for almost two years and the only way I got higher than 2.1 was through rooting. I'm sure that the root community will get it to us in some form, but my biggest concern is how well it will run, given that it's likely optimized on dual core devices that are becoming the standard.
If you're a stickler for correctness, EOL is End Of Life. And Sprint does not limit the number of upgrades you may qualify for.
Actually The Evo is no going on EOL anymore. Sprint confirmed that they will be selling it through 2012.
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