No, no - they haven't ceased business! We mean the deal between them has "closed". This means that as of August 15th, 2013, MakerBot is officially part of Stratasys.
The other implication is that while the leaders of the organizations have been obviously talking and planning for the past while, today all levels of staff in both companies will be able to freely talk to each other and engage in projects together.
It should be very interesting to see how the two very different cultures work together over the next few years. We suspect both companies will benefit and change significantly - and that change officially began last week.