KGI has published a new research note indicating that the 27″ model of the new “Retina” iMac will begin shipping before the end of this year. However, according to the note, a 21-inch version which is currently in development will not be released until the beginning of 2015, probably alongside other products “early 2015” like the Apple Watch and Photos for Mac.

With regards to the iPad Air 2, KGI says that constrained supplies are likely, with a possible initial shipment of only 7-9 million. Compare that to the original iPad Air, which kicked of sales with 12 million units. The iPad mini will be updated, but the changes will be more conservative than those coming to the Air. A 12.9″ iPad is also said to be in development, though no timeline seems to have been set for its release.

The MacBook line is unlikely to see any major revisions this year, KGI says, due to shipping delays at Intel that have prevented the availability of the latest processors. That means no 12″ MacBook Air or upgraded MacBook Pros until sometime next year.

Of course, Apple is also expected to debut OS X Yosemite on October 16th. You’ll be able to follow all of the action in Cupertino through a live stream on Apple’s website and live coverage right here on 9to5Mac.