If you look here: http://www.starcraft2.com/features/terran/nomad.xml

They just added a new unit to the line-up on the official site.

It's an awkward looking machine, probably could use some tune-ups in terms of not looking like something out of a Lego box.

However, it looks like this machine might be taking the place of the Science Vessel, while setting down turrets, and (?) possibly made to perform mid-battle repairs to vehicles and space-craft.

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I'll choose my role, and then I'll beat you.

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Q u o t e:
Hmm. Not sure I like it. So it basically poops out turrets? Meh.

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The Nomad will have abilities in addition to building Auto-Turrets.