The government no longer thinks that "Lex Koller" is necessary, they tried to repeal it in 2007
http://www.swissinfo.ch/eng/politics/internal_affairs/Property_rules_could_get_simpler_for_foreigners.html?cid=249824 but parliament sent the bill back to the federal council with a request that they consider the introduction of some safeguards. These included a minimum residence time as a prerequisite for the purchase of property, measures to solve the problem of under utilised second homes ("cold beds") and the bills compatibility with the popular initiative "Save Swiss Soil" there has as yet been no further progress. So when Sawiris requested exemption it was no big deal, he was after all the only serious bidder for the army barracks and training grounds which included lead contaminated firing ranges.
In order to deflect any criticism he first offered the property for sale exclusively to the Swiss, he only started marketing the development to foreigners at the end of the summer. By his own admission this was a tactical decision, he wants to gain long term acceptance here. The army has a lot of surplus land and property 90 – 95% of which is classified as unsaleable so there may be further opportunities in the future.