Thawte root change to 2048 bit cert and intermediate CA

["Flynn, Gary" <flynngn () JMU EDU>]

https://search.thawte.com/support/ssl-digital-certificates/index?page=content&id=AD221&actp=LIST&viewlocale=en_US

If they're changing their root cert and adding an intermediate cert, won't all browsers and clients have to have those 
certs added to their stores for SSL certs signed by them to be trusted? I don't see a 2048 bit Thawte cert in the 
latest patched version of Internet Explorer.

They have scheduled a presentation in June to describe the change coming in June. Given our experience with their 
presentation about the SPKI changes a few months ago and subsequent operational issues, I'm a bit anxious about this 
change even with their wording, "There is no action necessary on your part.  Your current valid Certificates issued off 
our MD5, 1024 bit RSA Roots will continue to operate correctly and securely. There is no need to replace your existing 
Certificates. Thawte is providing this advance information to ensure a smooth transition. Also, this information will 
help you in making your IT investment decisions e.g. ask the vendors if they support 2048-bit RSA keys etc.".  What 
about certs issued using their new root?

Any thoughts?