I very much doubt anyone outside of Apple is 'field' testing it after the Gizmodo 'leak', Apple don't even let their own employees take their test products home, never mind giving them out to be tested this far in advance. The dude who had it and wrote the article got pwnd by Apple and the feds.
The A5 chip is a dead give away, unless they have the A6 ready (I'd be shocked), Apple are (trial running?) using another manufacturer for the A5 chip now as they are in lawsuits with Samsung, who currently makes the A5. Anything else is pure speculation and I recommend joining an Apple forum to discuss and speculate further, because most posts on here will be what his mates brothers fathers uncles second cousins aunties nephew thrice removed said and he works for XYZ mobile phone company so knowz whats what init.