Is there going to be a QtCreator plugin for TortoiseSvn ?
Qt Creator supports subversion for ages already.
TortoiseSvn is just another client for subversion.
How can i use TortoiseSvn with QTCreator ?
You cannot and you need not. TortoiseSVN is just a GUI that uses the command line tools of svn (respectively the libs that do the work) and Creator has its own GUI for this.
So how can i use svn with QtCreator ?
Qt Creator uses the command line clients for version control.
For SVN on Windows, for example "slik SVN":http://www.sliksvn.com/ can be used.
The executable can be configured at Tools -> Options -> Version Control -> Subversion.
It does not necessarily need to be in the search path.