It seems to be a new thing on e-cas.
I'm in the same situation - I only have one line on my part saying "we received xxxxxxx's application for Permanent Residence on July 27th"
and my status of " in process" remains the same.
IMO, CIC are putting that on e-cas as a way of making us feel that they're doing something with our files but I guess it means our files are in a queue for processing or maybe even in transit to the VO.
I haven't received AOR2, but it's nothing to worry about. If you've received SA over the phone or email/letter and now your status on e-cas is saying "in process", that's normal.
I hope you feel better knowing that we're all in the same situation ;D
;D We just have to be patient!