According to the latest news the new metro line in Budapest, Metro 4, is supposed to be finished by March 2014. The deal most be accepted by supervisory authorities, but if they smile and say yes, we can hope to see Metro 4 opened in Budapest by the end of March 2014. Of course, no one really believes that it will be finished by then, but at least we can hope. It would be great to remove all those construction locations around in Budapest to make space for car traffic again and of course to be able to use the metro connecting Bosnyak tér on the Buda side with Kelenföld railway station on the Buda side!
Go for it and wish you good luck in the process of finishing the metro!