just to back up what I said here is an article from today 24th December which starts to detail some of the expected changes
http://www.enet.gr/?i=news.el.politikh&id=235913
the first item I reproduce below from a machine translation
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What eventually changed professions under the Memorandum:
* Tuition and language centers. It removed the restrictions to practice by residents of third countries and the obligation to have a specific legal form.
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note that the above is a declaration of "direction" rather than the final "law". It will all come out in the wash over the next couple of months
as a general point there are many many changes that will affect and change all sorts of current conditions/requirements and we cannot be sure to report them all. It really is a good idea for everyone to try keep up with what is changing over the next say 6 months and pay a bit of attention to the Greek news so you know of things that could affect your personal interests