Heller addressed the right to keep a firearm in the home for self defence. In the Heller case the SCOTUS ordered Washington DC to _register Heller's gun_. It did not address whether registration was constitutional, it did not address whether licensing was legal, it did not address whether carry outside the home was legal. It only addressed possession within the home.
McDonald only addresses wether the 2nd Amendment is incorporated against the states, nothing more nor less. McDonald wants the SCOTUS to accept that the Heller case decision invalidates Chicago's law preventing him from registering a handgun to keep in his home for self defence. It is a duplicate of the Heller case. Carry outside the home is not addressed.
The win in McDonald (if SCOTUS rules in his favor) will be that states and municipalities will no longer be able to ban possession of handguns in the home, the big win will be if SCOTUS sets a high standard of scrutiny for validating gun laws as constitutional (strict scrutiny is the best) as this will bind courts all over the country to go over legislation with a fine tooth comb when local, state or federal laws are appealed.
Palmer Vs DC is the next case, making it's way towards the DC Circuit court to address the right to carry a gun outside the home. There is a long discussion thread at Calguns.net. If the DC circuit rules in favor of Palmer and the DC govt. folds, then this will not even make it to SCOTUS.
Luckily, saying 'gun' to DC Mayor Fenty is like ringing a bell in front of Pavlov's dog, or tapping someone on the knee with a hammer - he reflexively kicks and slobbers. So the Palmer case will probably make it's way to SCOTUS, and they are likely to take it, as Alan Gura picks clients that SCOTUS will not have a problem with ruling for (only fine upstanding citizens from a diversity of backgrounds need apply). Again the Palmer case does not address licensing or registration, only the right to carry.
If and when Palmer hits SCOTUS then the debate about concealed vs open carry comes into play. In the dicta (non binding comments or asides) of the majority opinion in Heller it was noted that long standing prohibitions including those on concealed carry were not invalidated by the ruling.
This does not mean that a prohibition on concealed carry would be made by SCOTUS, or that they would uphold prohibitions on CC, it just meant that it was not being addressed.
To the degree that the dicta does telegraph the prejudices of the Heller majority in SCOTUS, it may mean they will rule that open carry is a right, but concealed carry is a privilege subject to regulation by the States. As CC is a privilege afforded to the majority of citizens in a majority of states, CC will not go away in those states. DC, California, Chicago and New York may on the other hand end up having to allow open carry of firearms.
Potentially SCOTUS may rule that both CC & OC are a right. Or that a state must allow one, but not necessarily the other. Bear in mind that if/when Palmer hit's SCOTUS they will probably only rule that a carry license must be issued and then another case will need to be found and appealed all the way to SCOTUS to invalidate licensing or registration as a requirement before a citizen can exercise their constitutional right.
So don't panic!
If you want an in depth look at how SCOTUS may work out how to allow infringements on a right that may not be infringed, have a read through
http://www.law.ucla.edu/volokh/2am.pdf