Current Cambridge undergrad applying for the LLM here. I wouldn't worry too much about progress of this year's applications compared to last year's, from speaking to someone involved in admissions last year it sounds like there were a couple of people on the admissions team that were really organised over xmas so the applications they were involved in were moved on much quicker than others. I believe that due to the lateness of the final decisions last year there have been some changes in the decision making process (although I don't know exactly what) so the timing between years isn't really comparable. I can't explain the person who seems to have moved on, but they are certainly the only person I've heard of who has done so.
Cheers for your kind information! So I presume that still the offers would be sent between 1-15 March as originally stated, right? :)