Found this website but I'm not an expert and don't claim to validate what they post - however it does make sense.

http://www.advisor.ca/tax/tax-news/tfsa-limit-is-10000-what-does-that-mean-for-clients-181374

Clients over age 18 who have not contributed since the TFSA’s creation in 2009 now have $41,000 in contribution room. Carol Bezaire, vice-president of tax and estate planning at Mackenzie Investments, says CRA won’t penalize anyone who adds another $4,500 to their TFSA after April 21, 2015, even though the budget hasn’t technically passed yet. That’s because CRA considers the budget’s pronouncement law.

Also:

http://www.tfsa.gc.ca/

The "Proposed" increase is highlighted in red and the page was updated April 21st - yesterday.