Ticketek are allocating the 5 Cat D bays at one end as Manly (118 etc) and the other end as Melb (140-144) but I wouldn't worry too much about that. The 14,000 release is scattered through all sections so heaps of the seats in those bays are already sold to whichever supporters anyway. My sister in law already had tickets in 140 from the first release so we got them about 10 rows back from her even though the woman said that end is Melb.
The bay we were in last year was supposed to be Manly designated but there were plenty of Melb & neutrals in amongst it.
Interestingly, when you try to buy by internet today it asks for your code (which has "MAN" in it) and it still allocated me bay 144 for Cat D so I think the Manly/Melbourne specific areas aren't gonna mean much.