HP Pro x2 612 G2 is a convertible you can upgrade
 

We're fans of the Microsoft Surface around here, but there's no denying it's a consumer-grade device. Technical-minded folks often prefer a device with some measure of upgradeability and superior durability. If you're one, but you're keen on the whole Surface concept, maybe take a look at the newly-refreshed (and unfortunately-named) HP Pro x2 612 G2. HP is showing this highly-extensible Windows 10 detachable PC at the Mobile World Congress.

http://techreport.com/news/31505/hp-...ou-can-upgrade