You can pre-order the Garmin Forerunner 935 at Power Meter City (PMC) in the USA. Josh placed his order with Garmin 5 minutes after receiving the formal notification of the 935. His orders are mostly for the BLACK/non-bundled 935s.
PMC expect to see the first units arriving in EARLY APRIL. If you want a 935 before the tri season starts NOW could be a good time to book one. Good luck!
It looks like Wiggle may have the UK exclusivity on the 935 for a while for those of you who want to pre-order over here.
There is 10% off most stuff at Power Meter City with the coupon / discount / promo code: the5krunner10. HOWEVER It will not work for the Forerunner 935. Sorry – there will be a 10% store credit instead for Garmin products. That will be at list-price everywhere for some time, plus Garmin sternly frown upon discounting in any case while products are under MAP.
I will update this post with links to Amazon and with links in the UK as they surface. It looks like Garmin may have been bumped into an early release as too much information was leaking out before the official date. Maybe.