This may or may not be relevant - but when I go to My BT and check "My Extras", there is a BT Sport section that says "You are ready to watch BT Sport from 1st August".
Mine says that now as well, so it might be relevant.
I also have been on the latest software for a couple of weeks, no sports channels, yesterday I logged on to MY BT and found the BT Sport section in the"My Extras", clicked a couple of boxes and was told that I will receive BT Sport from !st Aug.
Last night I updated the Youview software, This changed from 14.0.0, 1.7.0, 492, 28 to 14.0.0, 1.7.0, 492, 29.
I checked the program guide and the sports channels were there and I could watch the trailers( I am on Infinity and so I could also watch in HD) 900 was also there.
I also have a 160 Gb black BT Vision box, I checked it this morning and the software dated 11 Jan 2013, has been updated to the latest version - BONUS
My Extras sport now says "You are ready to watch BT Sport from the 1st August.".
What issue of Youview software are you on, If it is not as I stated previously, it does look like you will have to wait for the phased roll out., as mentioned Here
Mine have arrived too Sport 1 & 2 on 507 & 508 & Sport 1HD & 2HD 0n 510 & 511