New Office 365 Customers can have Business Essentials or Premium from October 1th, with all the benefits of this New Office 365 Service Family.
But what about customers allready on Small/MidSize Service Family?
Because there is no Upgrade Path from Small/MidSize to Business Service Family, customers with Small/MidSize Service Family will have reduced price and increased functionality at the end of their agreement period.
Increased functionality will be a Maximum number of users to 300, which is alot better for Small Business Plans.
Microsoft tells us an Upgrade path will come around within the next year.
Read about the New Business Plans at Technet Office 365 Plan Options.