What we're trying to achieve in Poseidon is the answer to most of the questions you hear now - how easy it is to upgrade? what's gonna happen to my mods? how about load-balancing? etc. Dolphin 7 is going to be close to Poseidon in terms of user-side layout and features implementation, but in the core you need something highly configurable, something that treats every little piece of functionality as a separate module, something like Lego-Blocks if you will - do what you need, upgrade, play, configure, see more change - it's still sturdy and usable. That's Poseidon.