All we know so far is that there is one house in Leyawiin (more or less the size of Proudspire Manor, based on its external size, but we don't know the details). But looking at other "Chapter" zones, usually we have:
- One very small & cheap house (usually an Inn room).
- One large / medium house available for in-game gold.
- One large manor available for free (quest or event).
- Two crown store only houses.
It will be wierd (and even kinda disrespectful) if non of those will be Argonian - themed, as this chapter is supposed to have strong Argonian vibe.
So, yes - Argonian themed house is something that we should expect and we have right to be disappointed if it won't get any.
Undestroyed small Xanamer (unlike Lakemire Xanmeer Manor that has un-removable rubbles and is too big in general) or Lilmoth wooden architecture hut would be awesome.