That looks much nicer than the older blue one 
Agreed Snoopy, so was pleasantly surprised as I was unaware of the change until earlier this week when I found these pics and was thinking but that's a rcd310 sized radio? ... it blends in nicely with the rest of dash... so happy with that. Will consider the RNS510 upgrade at a later stage but at least until then I'll be content with the 310- the older blue one would've reminded me everyday that I didn't get the 510...
So it's a nice surprise... 
Be content. You'll hate the sound quality of the RNS510. I did. It's pretty rubbish compared to the RCD310.
You need to spec Dynaudio with the RCD510/RNS510 for decent sound. This is the bare minimum for acceptable sound quality.
The RCD310 matches the standard speakers very well and vice versa.
I've also heard the RCD510 + DAB radio with the standard speakers and the resulting sound is most disappointing. Just as hopeless as that from the RNS510.
I had to spend many thousands of £s to sort my sound system due to the terrible quality sound from the RNS510. (See my signature). An aftermarket Sat Nav would be much better soundwise than the RNS510.
I have a brilliant sound system now: but the cost was a bit eye watering.