New Diablo 2 Patch Coming, with Test Realms--Precursor to Fresh D3 PR Campaign?

On Friday, Bashiok over at the official forums posted a nugget about the upcoming Diablo II Patch 1.13:

"Some exciting news - and it also may be some comfort - due to the types of changes we're making we will be offering the Diablo II 1.13 patch for testing and feedback on a test realm before its release. We'll have more information about how you'll be able to help test it in the coming weeks." -Bashiok

Bashiok and Blizzard had created a thread requesting everyone's #1 'dream' patch note they'd love to see with 1.13. This is going to be the first content patch since 1.11, which added the endgame "Pandemonium" event throwing you into a questline culminating in a battle against Uber Diablo, Uber Mephisto, and Uber Baal at the same time in Tristram.

Whatever the content they're adding now is (~3 and a half years later), if it's enough to require a test realm before releasing it...it's probably going to be pretty extensive :)

This works as good Diablo III PR for them---get lots of people back into actually playing Diablo and excited about the universe again, which would then be a great time to draw them into the daily D3 news by making a big announcement (the 4th of the 5 classes, perhaps?). So I could see this patch, which could be out within a month or so by the look of it, being a precursor to lots of goodies on the way; the first shot of a big PR onslaught :)

Another thought: could the new content for D2 include some early D3 story/setup?