Replays of webinars can be found at maguibagua.com/webinars
To find out how to train with Li Baohua in Japan, details can be found at maguibagua.com. Li Baohua teaches mostly in Tokyo. Here is a link to Li's regular teaching in Japan. Li also has two facebook pages or groups, one personal and one for the Ma Gui Bagua Promotion Centre. I cannot always know excatly where he is, so you are best to check with his sites and pages.
There is an interview with Li Baohua in English at http://blogmartialarts.com/interview-with-magui-bagua-master/
July 20, 2013 The first DVD of Ma Gui bagua was made available from Amazon Japan. IT covers the first dragon palm change. http://www.amazon.co.jp/dp/B00CADB298. A new DVD is also availble, covering the second dragon palm change.
There was a MGBGA seminar in Beijing with Li Baohua in 2006 (photos) and again in 2009 (photos).