The EVE Online blog has been updated with a new post discussing the upcoming unified inventory window. According to CCP Optimal and CCP Arrow, the necessity for multiple inventory windows was redundant. To solve the issue, a new unified "all in one" inventory will be deployed.
The most obvious change to the inventory is the new tree view, which automatically populates with all inventory locations accessible to you at a given point in time. As if that wasn't a tough enough job, the tree view is also populated with any sub inventory location, so under your active ship you will see all bays present, under Ships you will see all your assembled ships and under Corporation you will see all the divisions accessible to you (the ones that you don't have read access rights for are hidden). Oh, yeah, it also shows containers, effectively making them quite usable, as opposed to the biggest usability violators in the history of videogames. It should be obvious that you can now move items between inventory locations without opening the destination window; just drop it to the relative tree view entry instead. If you prefer, you can drag and hold an item over the tree view entry to switch over to that inventory location to see the item appearing safely at its destination, although there is also a confirming blink when dropping onto an entry. You can also drag containers between locations within the tree, making life even easier.