Hi Richard,
I've got a number of version 10 clients who were concerned about this. While the concern is well-founded, no more payroll tax updates - as Richard mentioned, but we've just been updating the payroll tax tables. Now, the 941 and 1099 forms won't print just right, but we don't rely on GP for that anyway.
If the actual calculation method changes, they won't get the code (a la a couple of years ago), but if it's just the tax tables, they can just change them.
Kind regards,
Leslie