If charged as a felony, he is likely to be remanded unless he comes prepared to post bail. He should EXPECT it to be charged as a felony.
Very peculiar that they decided to send a notice that he has been charged rather than simply issue a warrant and wait for him to get snatched up. Guess this is easier. But, even if it is a felony, if he appears as instructed, the court may well be inclined to waive bail and allow him to be released on his own recognizance. Some courts can be lenient that way.
I would recommend he consult an attorney first thing Monday.

