Nice speech and reasonable decision that I am sure is brokered by Army. Anyhow, from the speech it is clear that all steps taken on 3rd Nov are considered legally verified. Dogar would retire on 21st March as CJ (appointed on 3rd Nov) and since the post would get vacant, it would be prerogative of government to appoint whoever as CJ and thus government has decided that they would appoint Iftikhar as new CJ, that means, Iftikhar was obviously a sacked judge and thus a dud lawyer between 3rd Nov 2007 to 21st March 2009. So, Iftikhar did not got reinstated but got a Job (choor Iftikhar ko naukree mil gayee).
As for Nawaz and Shahbaz, their position is still illegitimate candidate for any public office. Only thing is that, instead of these two thugs, it would be government that would apply for review petition in SC on their behalf (something thug brothers should not have had any problem as that review may get applied to SC with Iftikhar as CJ). Anyhow, as it is expected that Iftikhar would not get controversial and would give decision according to laws of the country, and that means, I would hope that bench under Iftikhar would hold the judgment of disqualifying thug brothers (disqualification as valid decision) else it would be seen as partial decision (that could happen as Iftikhar is paid goon of Nawaz).
As far as changing constitution, PPP and PMLN do not have enough seats in Parliament as well as Senate that they can change any constitution, so talking about any promise of changing constitution could not be possible ... as PMLQ plus allies and MQM together can block any constitutional change.