The mid year tax update is posted for GP10 and
coming soon for GP2010. Changes are only (so far) for Manitoba, New Brunswick, Nova Scotia and Saskatchewan.
New this time around: this is only the Canadian changes. At the end of June there will be a hotfix which will contain US tax changes and other bug fixes. You only have to install the tax update if you are in the jurisdictions involved – the hot fix in June will be cumulative and will contain the tax updates PLUS the regular bug fixes that normally would be in one service pack.
Here is the download link for GP10.
Here is the download link for GP2010.
Edited: June 9th – added download link for GP2010.