Couple of quick observations after scanning through the documents submitted as part of the planning application.
Piers - don't need to be included in the application as they can be added under 'Permitted Development'. Interestingly they plan for four piers but the one furthest to the east (i.e. next to T.1) could have limited access due to structures retained and not demolished with T.1.
Stands - the Planning Statement contains a table on page 16 which indicates that as a result of the development there will be a net increase of ONE stand (though don't worry, there's an additional 2,553 car parking spaces!).
And LAX, your fears over the extension just being bolted on to the existing T2 appear fully justified looking at the various illustrations in the Design and Access statement. They appear to be doing half a job...but who knows, there may be a subsequent work package to 'wrap' a new facade around the existing terminal.