Do I need to re-install many libraries (or similar 'house keeping' works)? Is the upgrade straight forward?
Apparently, from Arduino web, one need 1.5 BETA series for use with Due. For Pro Mini, UNO and ATMega2560, should one use 1.5 BETA or 1.0.6 (no beta, presumable stable)?
I am running out of code space. Wonder if the upgrade will install a newer gcc compiler and smaller code size?