No Chrome browser.
Microsoft says only it can build a good Web browser for tablets. We know how well that tuned out the last time they had the Web browser monopoly: five years of no improvements ended only when Firefox ate IE's lunch.
On ARM chips, Microsoft gives IE access special APIs absolutely necessary for building a modern browser that it won't give to other browsers...
This sounds like a repeat of the early days of Windows, when Microsoft gave its own applications access to secret APIs, making third party software run slower and then die.
By locking non-Microsoft applications out of 8RT, it can reengage its unquenched dream for monopolization. When Bill Gates said, "A computer on every desktop," he really meant "Microsoft software on every desktop."
Monopoly runs strong in the DNA of Microsoft.
PS: Intel is laughing at ARM (on whose CPUs 8 RT will run) for being limited by Microsoft on the applications it can run. Hmm..., maybe this is due to an agreement between the twin towers of the industry.