It's not good news. I think inflation will undoubtedly fall, and one months data is only one months data, but for it to fall over the year, you expect it to be falling every month.
The more obvious impact, as you say, is on mortgages as interest rates will now very likely rise tomorrow, and it sets an assumption they will rise next month too.
Longer term, I guess it helps bring down house prices and there's some evidence of that. The problem with ultra low interest rates is it really did entourage people to not be overly concerned by paying £10k over the asking price etc, as fundementally they could afford it. That is now much less likely to be the case.
I renewed three months ago, and felt unlikely. I feel slightly luckier now