DAB versus DAB+ in Ireland

Could somebody explain why, if DAB+ is far superior (as this article says), would RTÉ begin its DAB service this morning, 1 December 2008- http://blogs.rnw.nl/medianetwork/rte-to-launch-five-national-digital-radio-services- rather than a DAB+ service? I accept that RTÉ began its trial versions of DAB in January 2006, i.e. before DAB+ was released in February 2007. However, if the differences are so significant between both systems, why would they have not changed to the newer version by now, December 2008? Basically, I want to but a DAB type radio with Ipod dock, and I'm wondering which is the best system to buy now given the above. Thanks. 192.122.218.190