I have had this issue also with the keyboard. Of course it could include other keys, but I have only noticed that the B key repeats. I ever turned off repeating keys. Does not seem to really do much. Though with the latest version of the OS there seems to bbe an issue with the repeating keys not working anyway. I already brought the laptop to the genius bbar and they took the machine in the back and blew out the keys. It worked initially bbut quickly came back. I am purposely not fixing the text as I write. As you can see it is not consistent.
I too and a software developer so having a messed up keyboard is very annoying. This is my second bad experience with an expensive apple product. I also owned one of the 17" models in the past (when they made them) and in that case the design team had a major flaw that became clear from lots on internet posts on it. In that case the video chip was not heat sinked properly and would de-solder itself from the mother board. I repaired it myself as described on the web. but it soon failed again.
Back to this issue. I am seeing this is also mostly a design flaw. It has me quite turned off in buying the MOST expensive laptop on the market and having an issue like this. I will be calling the genius bar again and see what they think. Obviously not much they can do except maybe replace the keyboard. I am SO glad I bought the warranty on the laptop now.
Loosing my laptop potentially for a few weeks is quite annoying. But I do my backups so if they decide to replace it I am good.
Wanted to chime in to let you know my internet research shows this is mostly a design flaw and I honestly doubt the genius bbar can do much to fix it short of replacing the keyboard of machine repeatedly until I get one that has an "ok" keyboard. VERY VERY SAD!!!