Here's a test: Go to Sideshow's website and log in to your newsletter account. Below the list of weekly newsletters, you will see a list of "Newsletter Alerts."
So far,
every single time that Sideshow has done a Priority Preorder for an item, they have released one of these "alert" newsletters the Wednesday before the sale begins. If we don't get one of these newsflashes for Frodo on Wednesday, it will be a regular order.
This flash e-mail has always followed the initial preview image in the previous week's newsletter, which in each case always included an announcement of the Priority Preorder, with a time listed telling when the item would be on sale exclusively to newsletter subscribers. Hulk's preview did
not list him as a Priority Preorder sale item, and he started selling on Thursday. The Venom bust was
not listed as Priority Preorder item, and it started selling on Thursday. Etc.
Sideshow as set up a system for how they do the Priority Preorders, and I really doubt that they will deviate from it. Frodo's preview did not include this announcement, so I am expecting him to go on sale next Thursday night when the newsletter is released, following the pattern they have established.
Personally, I think the reason they are not doing a PP for Frodo is because there is no exclusive, and everybody who wants him will be able to get the TBD regular version. PP is for limited items that they know will sell out fast and be impossible for everybody to get who wants it. They apparently don't see Frodo as such an item, and want this central character to be readily available to all. That's my guess...