Renovations were probably scheduled a long time ago.
You're right, I remember reading about the plan while Obama was still president.
Glad they removed the gold-and-yellow striped wallpaper from the Oval Office. Don't know if the paper was the Obama's choice, but it was installed during the Obama period. The paper wasn't bad in itself, but wasn't suitable for the room.
In the DM's photo it looks as if there's new wallpaper that has a more a subtle, classic pattern.
It was reported that the renovations also included “computer IT infrastructure” replacements. Although reported as the last item, IMO, it was the main reason for the reno. Remember, the Kenyan took his computers and software and had established what was called “back channels” for his minions to communicate with him. At least this is what was reported way back around January.