Changing from Tumbleweed based on openSUSE 11.4 to Tumbleweed based on openSUSE 12.1 requires only that you delete some opennSUSE 11.4 repositories and replace them with the contemporary repositories.
(You can do this now, even before the repositories for openSUSE 12.1 become available)
Here is the central suite of repositories for Tumbleweed based on openSUSE 11.4:
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openSUSE 11.4_oss http://download.opensuse.org/distribution/11.4/repo/oss/ openSUSE 11.4_non_oss http://download.opensuse.org/distribution/11.4/repo/non-oss/ openSUSE 11.4_Updates http://download.opensuse.org/update/11.4/ Tumbleweed http://download.opensuse.org/repositories/openSUSE:/Tumbleweed/standard/ Packman_Tumbleweed http://packman.inode.at/suse/openSUSE_Tumbleweed
To prepare for 12.1 (or to switch to 12.1) you simply change the first three in the above list from the "openSUSE" repos to the corresponding "current repos", and achieve the list as follows:
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openSUSE Current oss http://download.opensuse.org/distribution/openSUSE-current/repo/oss/ openSUSE Current non_oss http://download.opensuse.org/distribution/openSUSE-current/repo/non-oss/ openSUSE Current Updates http://download.opensuse.org/update/openSUSE-current/ Tumbleweed http://download.opensuse.org/repositories/openSUSE:/Tumbleweed/standard/ Packman_Tumbleweed http://packman.inode.at/suse/openSUSE_Tumbleweed
Priorities: I recommend you leave them at the defaults (equal across all repos) for the transition (and afterwards).
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