As is tradition, this B&R announcement begins by saying that they will be changing the frequency of B&R announcements.
And then there's this:
It is worth noting that we don't plan on changing the current Standard B&R philosophy, meaning we still only want one window per year, barring an emergency, where we consider taking action in Standard.
I'm not sure I get the concept of non-emergency bans. If a card needs to be banned, ban it immediately; if it doesn't, don't ban it at all. This once-a-year interval makes even less sense for Standard than for other formats, since a year is proportionally longer for Standard.
I understand that they want people to feel confident that their chosen deck won't disappear at a moment's notice, I just don't think that's worth the trade-off of making everyone put up with an unbalanced format for months.