Hopefully I can get some help here, it's been a long time since I posted but I read quite regularly and have found a lot of useful information before

My situation is as follows: We saw an advert online for a condo near dover road so my girlfriend called up and then viewed it the next day, she liked it.
Amongst the usual questions she asked the agent if there are any fees to pay, as she knows that when I moved into my current condo in 2008 the agent did not charge me any fees because the rent was over $2500 but this practice seemed to have been dying out a bit. The agent informed her that there were no fees to pay because his company claim the commission from the landlord for rents above 3000 (we negotiated a price of 3100 and 2 year contract). She liked the place so the 'no fee' part sealed the deal and she signed the letter of intent that day. I went to view the place the next day and was happy so we signed the tenancy agreement with the landlord there and paid up the month's advance rent and the 2 months deposit, this was all fine as it's what I did when I got my current place.
That was just over a week ago, so we are now just waiting for our move in date at the end of June to come around, however today I get an email from the agent stating the following:
Hi Ms X, Mr X,
Here's some update news regards to the unit mention above.
1. (Not important here).
2. (Not important here)
3. Regards to the commission of the rental, according to new regulations, any rental of lesser den $3.5K monthly is bearable by both party as of 1st of May 2010.
Now this bit I am obviously not happy about. My girlfriend first viewed the place on 3rd May and we signed the tenancy agreement on the 4th, both these dates are after 1st May and no mention was made on either day of 'new regulations' around commissions. As far as I know, these commission regulations are not regulations at all as different agents seem to do different things.
I'm just going to tell the agent no chance we're not paying, get it from the landlord and if he won't pay then tough luck, one of the reasons we took the flat so quickly was because there were no fees, if we had to pay we would have looked at a few more and probably used my old agent who still does not charge fees for rents above 2500.
So I guess my question is - does anyone know anything about these 'new regulations' that supposedly came in on 1st May and are we legally obliged to pay anything?
Thanks a lot
JC