Tech Guy,
appendTo plans to start looking at the 1.9 release of jQuery next week and start making it Win8 friendly.
There are several things that jQuery does that Win8 does not like (as you listed above).
As we did with 1.8 we made sure any errors at load time and runtime were removed. In addition we provided a flag to tell Win8 to not complain if we, as a developer, know what we are doing.
As we make these changes we run the existing jQuery Unit Test suite (6000+ tests) to make sure we didn't break anything accidentally.
Keep watch at http://twitter.com/appendTo and http://appendto.com for additional news
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Elijah Manor - Microsoft RD, Microsoft MVP, ASPInsider
http://twitter.com/elijahmanor