The Tour officially only has the 4.7 OS... (operating system) Hopefully by the end of this year we will get OS 5.0 which changes the OS a little in a good way.
I also just got my Tour, and I am very new to BB. But I was able to download the leaked 5.0.230 and install it on my phone no problem. When the official update comes out I can just switch over to it. A quick search would yield you easy instructions.
The most notable difference is threaded SMS support. Previous versions did not have this. I was used to it on my Touch Pro and Touch Pro2, and I was suprised the BB tour shipped without support for it.
But the OS 5 update solved that for me. Good luck and welcome!