An interesting thing that I noticed from that presentation (https://c.ymcdn.com/sites/www.cerc.ca/resource/resmgr/government_relations/Express_entry_national_stake.pdf) is that CIC seem to have been a bit more transparent with their statistics than they are elsewhere - by breaking down CRS scores held by people on March 28th 2016 into 10's rather than 50's. I can only approximate this as the numbers aren't given, only a bar chart without the underlying data - but I'll give it a shot. Bear in mind that the statstics for everyone over 470 CRS reset 5 days prior to that snapshot, as on 23rd March there was a draw with a 470 cut off. It's not an especially large sample on which to base my estimates, but it's about the best I can find. I'm also using the 2015 year end report to assist with my calculations.
In my estimate, it seems that on 28/03 approximately 0.1% of the entire pool had scores in the 270s. On 3rd January there were 60,042 candidates in the pool. Assuming that the numbers remain broadly stable throughout, That would mean that in that 5 day period, approximately 60 people entered the pool with a score in the 470s. The number of people in the 460's is broadly similar, but the number of people who entered the pool in the 480's appears to be around a quarter of the number. Let's be generous and assume half so perhaps only 30 people.
There have been no draws below 470 since April 20th and since then there have been 176 days. On that basis I can approximate that there are 1056 people currently backlogged in the 480s (likely between 480 and 481) and 2112 people with scores in the 470s. That analysis puts away any suggestions that there are thousands of people waiting in the 480s like some are suggesting on here. A very small percentage seem to get that high a score. The difficulty is (and always has been) that with relatively modestly sized draws where half of the draw goes to those with PNP or LMIA there are few places which can be allocated to those based solely on CRS. I'm optimistic that when they change the points given for LMIAs that we will see a reasonable drop in the required CRS score.