While changing our long term plans (our main goals (including our global plan)) is not normal for us, as they are pretty much the same as yesterday. It is normal for us to change the details of short term plans (specially with precise date) as we cannot foresee such things yet with profound scrutiny.
Related: Plan alterations >>1599, Planning the unknown >>1220, Global plan [upgrade] >>1634, Long VS short help >>1550
