1. No it isn't. You can continue to use the "classic" DPS system.2. You
can make separate versions of your content for phones vs. tablets. Note
that in the new DPS system all content can be displayed on all devices
(even fixed layout content) and we'll scale and letterbox/pillarbox as
necessary. This dramatically reduces the amount of versions of your
content you have to make. Also note that even with the previous DPS
system our guidance is to only create one rendition for tablets, not
separate ...