A fully functional computer
speculation at this stage .... not been properly tested and people don't even know what it's going to cost 
and saying that, I'm very pleased with my Edge 1000 .... I'm using version 12.20 software and it's working like a dream with no problems. You need to know how to set the unit up and what to enable/disable. Those who still have problems using v12.20 software have most probably not set it up properly
I have the heartstrap, cadence sensor, speed sensor, Garmin varia radar unit, and the remote control button
battery life seems ok (I have done a few 7hr rides), but if I need to charge the unit on longer rides, I have a powerbank. I doubt that the Hammerhead will offer as many features as the Edge 1000.
They've stated the cost:
$299 for early adopters, $499 on full release
£250-£275 gets you a used Garmin Edge 1000 off ebay in good condition (if you are patient).... I bought my Garmin Edge 1000 with all accesories (excluding the radar unit and the remote control) for £275 off a member from this site
well worth the money.... a few bugs on the earlier versions of software but those have been sorted out now .... still a slight glitch (sometimes), and that is when you get to some intersections/turns, it still assumes that you are a few meters away, so you are not sure which way to turn. That is because I normally have Glosnass switched off, and the unit works on other satelites .... (I think it's the same ones that mobile phones use)
set it up properly (use this link
http://www.forgot.co.uk/garmin-edge-navigation/garmin-edge-1000/ but also read all the comments,
and also check the garmin forum:
https://forums.garmin.com/forumdisplay.php?464-Edge-1000get the remote control, and you have no problems at all in the rain when it comes to switching screens (press a button, and it's instant)
Glossnass updates the unit every few seconds, but uses more battery power (that's what I read and assume is correct, so I have switched mine off)
on todays ride of 140km, I had a few instances where this occured, so I switched Glossnass back on, and problem solved
in a nutshell, if I lost my edge 1000, or if it had to break, I would buy another one without hesitation, even if I had to pay full price ....
linked to the radar unit, it makes cycling an absolute pleasure
