There should be no trouble networking Moodle 2.0 and Moodle 1.9 together. However ***please test it thoroughly, well in advance** (for maximum points of helping the development team, do it while Moodle 2.0 is still in beta )
Having said that, the new MNET test client you find in the administration -> development tools item in the admin block in Moodle 2.0 will not work properly with Moodle 1.9. However, this is just for developers, so shouldn't affect you anyway.
Moodle networking (MNet)
MNet and Moodle 1.9-2.0
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