Poly-Control first came to market with a completely retrofittable door lock (only the inside hardware is replaced) for Z-wave-enabled integration. At CES 2013, the company, exhibiting in the Z-Wave pavilion, announced a new puck form factor (thankfully) and wireless control/access via Bluetooth, NFC, RFID and WiFi.

Even with the revised form factor, the lock is still chunky but in time it should come down in size.
OVERVIEW:
Native Communications: Z-Wave (shipping), with plans for Bluetooth, NFC, RFID, Wi-Fi
Integration friendliness: 4/5 (too soon to tell)
Retrofit: Replaces virtually all doors and locks, even non-standard
Keyless entry: Z-Wave/keyfob, NFC, RFID, Bluetooth, Internet
Aesthetics/finish options: 2/5
Bonus points: +1 for communications options but too soon to tell (+2 more if they deliver)