I like the new bass-heavy theme tune (although the new "flash-by" end titles will take some getting used to). And I want "The Stowaway" on mp3 asap!
It had a plot, and didn't sag in the last half - and the characters weren't black-and-white, even the intergalactic yuppie swine who survived. Lots of nods to past stories - the hull breach and a character being sucked out from "The Mutants", merging spaceships from "Nightmare of Eden" (although resolved rather more easily here), and of course the Hosts being strongly reminiscent of the Voc robots, down to the "kill, kill kill" with outstretched arms. And the hand-in-the-door sequence, of course - too close to be anything other than deliberate homage. Max Capricorn ended up channelling Davros through the "Frontios" mining-machine (and just for a millisecond led me to believe, as he trundled into view, that we were about to see John Lumic again). And of course the teleport bracelets were "Blake's Seven", while a "reconstitution" like that of Astrid was first, I believe, attempted by Mr Scott in "Star Trek".
Didn't like the "I'm the Doctor, I'm a Time Lord" speech though... I thought the "noble self-sacrifices" could have been spread out a bit beyond the one location, and I did wonder what the fork-lift truck was doing there - plus there's the inconsistency over the money (if we take the Doctor's valuation of Mr Copper's card to be correct, the Van Hoffs' phone-bill would be about a hundred quid, which may be steep but not exactly disastrous). But they were my only real niggles.
DD sobbed uncontrollably at Astrid's demise. She is such a highly-strung young lady!
Enjoyed the season 4 trailer too and I've re-watched it a good few times today - I see it is up on YouTube already... here if people want to see it