It is now available for digital download, the full box set of 3D, 2D and extra features, from Vudu 3D on Feb 25th.  
It is expensive, for sure,  at $36 for the set.  
Also, some over at AVSForum have claimed to order the BD 3D for $30US preorder through AmazonUK expected to ship March 31.   I don't see this as a money saving, but those ordering the UK version don't want to wait and don't like movies over the internet.  
I think the 2D has been announced for March 18 release in BD.  
We watched the 2D yesterday because the 2 yr old grandson can't wear 3D glasses yet.  After seeing the 3D, the 2D is... well... Flat! and lacks inspiration ( for me)  There are many scenes in the 3D that just fill up the room with the action.  
I understand that the 3D/2D US box set will be released in the US for $55 Retail in late May or June.  This is what I will call a rumor source.  
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Cloudy with Meatballs was OK 3D.  The kids liked it but, IMO, just another average animated kids story.  I watched about 3/4 of it and got called away so I'll have to watch it later to see how it ends.