2014 is just 4 years away, so don’t get too cozy with this report. They may connect the dots sooner - or they may have a pad explosion similar to that which killed Marshall Nedelin (Soviet Union Strategic Rocket Forces) and some key engineers. The latter would be nice.
As for solids - the tricky part is fabricating large propellant grains. That’s why the Soviet Union was using liquid fueled missiles in their boomer subs for so long.
Iran has already demonstrated a three stage operation with the solid propellant Ghadr-110/Ashura program 2,000 km range designed is now being produced for deployment which has finally been publicly acknowledged after completing development to replace the liquid propellant Shahab-3B, 3C/Ghadr-1 already deployed.