Hard to say what has been going on. I seriously doubt that Giggs had any authority to act in the transfer market. We did hear that he briefed Van Gaal on club matters whilst the latter was in Brazil but no more than that. Giggs was there to hold the fort until such time as Van Gaal took up his appointment. Whether he takes over as manager at some point is anyone's guess.
Personally, I don't expect too many new signings before the start of the season. For all Woodward's talk, I wonder if the cost of buying the players we need hasn't caused the Glazers to think again. Signing players like Hummels, Vidal, and one or two more will cost well over £100 million, maybe more. I think we'll go through this coming season with what we've got, minus a few more outgoing transfers, and that Van Gaal will promote some of the youngsters. I've no objection to that and from what I've seen, there's some really good players amongst them. Trouble is, bedding in new players takes time, whether they're incoming transfers or youngsters from the reserves, and time is the one thing we don't have in spades. Another season out of the Champions League and the suits will be worried men indeed. Not saying it'll happen, but without considerable strengthening (replacing the players you've mentioned for a start) it might.
Don't forget what Woodward said just after he was mouthing off about money being no object. A nice little hole to wriggle through if we don't sign anyone:
"It’s also worth commenting that we’re not in Europe this year, so there are fewer games and Louis may take the view that he wants a tighter squad to bed in."
"If you do the analysis over the last year, Liverpool performed extremely well with a smaller number of players, but that’s a decision for the manager."