The 1.02 version is the same as the 1.01 with the fix #3. Since it includes a few source code fixes a new game is required if you dont have fix #3. The major differences are that the fix files have been packed into the BSM.AZP archive. If you already installed the fix, you should ignore the 1.02 version. A new version will be available in a few weeks/months which will require a new game. I recommend waiting with a clean install until then.
If you have used the Class System v6 it'll be completely compatible, no need to start a new game. You don't even have to install the 1.02 version since everything is included in the Class System files.
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