Quoting the article from The Register about an internal memo on Nokia cuts in the company, this is the interesting part of the memo:

"The Windows Phone organization has started to ramp up its operations and a large part of that organization will be in place by the end of 2011, and Nokia aims to retain as many people as possible from other areas, such as the Symbian and MeeGo organizations.
There will also be opportunities within the Meltemi organization, for personnel working within the MeeGo teams."

From this memo it seems that the Meltemi organization and the WP organization are two different things.

From TabCo's twitter:

"SupaKeith Keith Dean
@WeAreTabCo what's your stock symbol?
6 Lug
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@WeAreTabCo
TabCo
@supakeith We're a privately held company backed by some great investors."

They could be a private USA company backed by Nokia or Intel...

Oh and one last thing. They asked via Facebook this question:

"We have another question for you. (We're full of them, if you couldn't already tell by the name of our page.) How many apps do you have on your smartphone or tablet?

-Enough to get me by – weather app, map app, Angry Birds app, beer locator app...
-All of the apps in the Apple store. Yep, that’s right, all 350,000 of them.
-Well…um…ok, I don’t have a smartphone OR a tablet. There, I said it!
-No Games, only useful apps. Games are much worth to play in PSP or NDS"

If they were using MeeGo as their OS it would make sense since they couldn't offer a huge selection of apps.