You sure you didn't end up on some Hardcore servers?
I also have this issue. if i press esc i can get back spotting markers and name tags but the minimap has gone. i also noticed some greyed out letters and numbers on my screen that are in random places.
This happened after the december patch.
i have tried repairing my install but this does not find anything. i was playing with a friend i asked him if he had any issues and he told me his UI looked fine he had minimap etc
it would appear looking at the battlelog forums this happens on consoles aswell.
