Firstly, Louis choosing this day, of all days to follow Harry and Zayn on Instagram, when he never has before. We know that he left Syco (his label) the day after the 10th anniversary of his first X Factor audition. Could this indicate something significant in terms of his contract/situation changing?
Also, we know the anniversary events was planned by Simon Jones PR (1D's old PR team) but fans have also been displeased at their how do we say... lack of quality PR in the past. The fact that each member minus Zayn sent out one (or multiple) thank you tweets but did not acknowledge Simon Jones PR or any of the planned events is very interesting. Given the release of more remastered videos over the next week, plus the significance of 10 years of 1D just passing (which some fans speculate to be the end of some binding contracts the band may be under), is it possible that the band has organized something of their own to be released after the anniversary? We know the band does not care for Simon Cowell/Syco so it is absolutely possible they put in the bare minimum of promoting the 1DHQ materials so that wouldn't make money.
And we can't forget the whole Reason Being thing. Basically, if you weren't on Twitter/Tumblr today, fans found the phrase "Reason Being" listed on their anniversary website when the site had crashed, as well as in one of the artists on their remastered music video for What Makes You Beautiful on Apple Music (it was listed as One Direction & Reason Being). I have no idea what this all means. Totally possible Reason Being was just a placeholder to throw fans off the scent of the website or something before its release, and that it not being taken down points to the incompetence we know 1DHQ has... but what if it's something else? Rebrand for the band? Name of the documentary that was supposedly supposed to come out during the reunion?
The rumoured Infinity music video? Is it going to drop anytime soon? Maybe as a surprise after 1D week events?
Finally, Liam has said (multiple times I think) that him talking about the anniversary plans that 1D were making got him threats from Louis (that Louis would egg his house). Why would Louis threaten to egg his house over a website and a few remastered music videos? Just hyperbole? Or was/is something else planned that they know is huge?