I would like to make one important point.
When they introduced the rules for the high ratio group last year there was no effect because everyone borrowed money from various sources and faked the 20% down to avoid the stress test. 
This is really 2 CHANGES in one. As it will affect both groups with one blanket statement.  
This one is a game changer and it will be bigger than they even anticipate! 
Also take into account that prices have decline over a 6 month period there is little interest in taking a risk on an asset that is cash negative.(rent does not cover just interest payment) This is why sales are down -40% over the last 6 month. Volume is a very key early indicator. Prices will follow but not until 6-12 months after. Can you be patient?That is the key question. People still have massive anxiety over Real Estate and they need to calm down and let these measure take full effect. Should see a -20 to -30% correction. I don't think it will crash but still a material amount.