If you must include loops and samples, do it as an add-on package. I don't want that trash filling my hard drive. I use quality instruments. Junk instruments that I have no use for don't justify a price increase. A large pile of stuff is not a better product. Include such things as optional add-ons for those interested. ...Just build the best workbench possible.
Price aggressively. $50 introductory price. Increase to $100 two months later. $100 to update to newest version, offered every 6 months. Offer peripheral products like iPhone app, and iPad app. You're going to want to be in that market as it develops, so get your boots on the ground now. Forget Linux, they don't even have interface drivers.
Workflow is all that matters for a DAW. That's what you can offer. Be fast, be easy, be clutter-free. Be compatible with VSTs and hardware controllers. Do not try to be "like the other DAWS but new and shiny", or you will fail to find a userbase sizable enough to be a sustainable player in this market. You need to appeal to garageband users with ease of use, to songwriters with speed of use, and to free DAW users with a low price. You will not compete with Cubase/Abelton/Logic/ProTools. That market is locked down. Go directly for the hobbyist & semi-pro users. Forget the pros, all they do is complain and they are already locked into their current DAW anyway. Just ignore them, they will only drag you down. Make a DAW for musicians, not engineers. That's what the world is missing.
"A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away." - Antoine de Saint-Exupery
Bitwig, make me a table.

