I have been going to Hong Kong pretty regularly since I started working, and I have noticed a steady increase in Mainland tourists. There is more Mandarin Chinese (the standard language of the Mainland) than Cantonese (the standard language of Hong Kong) spoken, and now most of the sales people will speak Mandarin first.
One of my favorite things to do is to eat street food from one of the many street food vendors in Mong Kok. Find one that is busy, and they are all pretty yummy.
Shao Mai, one of the most common street foods available.
Hope you enjoyed my trip to Hong Kong!