Hi Leo.
Instead of guessing what might go wrong I would do an evaluation on this. Both (TestStand and CVI) allow to evaluate it for a period of 30 days (i guess). TestStand got tons of new features since 1.0.1. You will like them.
I frequently work on code modules used by step types. The code modules are created in LV >= 7.0 or CVI >= 6.0. The step types are created in TestStand >= 2.0.
Using the step types in a later version of TestStand does not introduce any incompatibilities. --> I cannot complain.
Regards, Guenter