There's an article today from Rothstein at Annarbor.com regarding Isaiah Sykes's official visit this weekend.
Rothstein's article includes a number of quotes from Sykes, including the revelation that "he might take an official visit to Arkansas 'in a couple of weeks.'"
Also this regarding Zeigler's commitment to CMU:
Sykes said Zeigler’s decision helped him with Michigan.
“It gives me a better chance of me going there, playing there,” Sykes said.
Sam Webb mentioned earlier this week that 2011 prospect Eric Katenda
is also may also be taking an official unofficial visit this weekend. And it's been reported that Beilein will be at an in-home visit with 2010 power forward Cody Larson on Sunday.
Note that Michigan has only two scholarships left for the 2010 and 2011 classes.
EDIT: Updated with better info from UMHoops.com.