Here's a "me too" with some additional information.
The other day I installed updates and the touchscreen stopped working. I tried all of the various potential solutions I could find, short of resetting the device, to no avail. So I went ahead and did a reset. I thought about doing a "refresh" first, but decided to do a full reset.
After the reset, the touchscreen worked again. Nice thing is that it was able to restore a "backup" from the "cloud" so that all my apps were there (though not logged in, in the case of apps like Netflix). And, as expected, now a lot of updates were available.
The updates came in a couple of waves. After the second round of updates, well, the touchscreen stopped responding. It's pretty clear that one of these updates is the culprit. I tried uninstalling a bunch of them (though not all) to no avail. Interestingly, one of the updates (KB3021910) could not be uninstalled. This, as far as I could tell from sorting the list, was the final update installed. It may be the one that is the cause.
My next steps will be to try a reset again, and this time install updates a few at a time to see if and when it breaks again. Hopefully enough people are reporting this that Microsoft will see fit to fix it on their end, despite the fact that Windows RT is effectively a dead product now.