Until having reciprocal upgrades is announced, no one knows when or even if they will be available in the future. In theory, when the programs are fully combined there won't be any free or even sticker upgrades (not that I expect that). In other words, if it hasn't been announced all you're asking for is speculation - no one posting here has any concrete info until it's made available publicly by US and/or AA.
You can be sure that once something is announced it will be in either the last couple of pages of this thread or have a thread all it's own. There's no need to read all 965 posts in this thread (including this one). While it may seem snippy, just count the number of posts asking the same question in the last 2 plus a little months - it's so much easier just to write a post asking if or when reciprocal upgrades will be available than do a search or read the wiki.
Jim