[Keith]

Why would they chose a Tuesday to reveal their new brand identity?  Surely a Monday would be a better starting point?

As in many organisations, when it comes to implementing anything new, there are various operational considerations at play.

Presumably for similar reasons why BBC have opted for using Tuesdays on a number of occasions.

In theory it means that they don't have to pay for additional staff to come in (or be on standby) on Sunday to make final checks and switchover stuff. By waiting it until Tuesday they can do these tasks on the Monday when those staff are normally on site. Similarly third-party companies/support is more likely to be available on Monday and Tuesday, compared to on a Sunday.