Where sales embargos can be enforced, they have been. As for indies - I'd guess much of the book building was to very large existing holders. (Robinson??) I personally doubt much of the initial placement was to new holders, so a 2-4p rise probably won't be sold heavily. (IMHO) These guys are looking to reduce their average price (much like most of us!) and if the promises (finally) start to come good, these guys will stick.
L2 consideration (IMHO) is irrelevant at this stage.