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 ...