Either as an elven outsider or a born and bred Tevinter slave, playing as an elf will have new dimensions in Dragon Age: Dreadwolf and will also give the series a chance to explore elven culture within Tevinter for the very first time.

Source: https://gamerant.com/dragon-age-dreadwolf-elven-culture-solas-antagonist/

If past releases are anything to go by, BioWare will have multiple editions of Dragon Age: Dreadwolf with various preorder bonuses.

Source: https://www.digitaltrends.com/gaming/dragon-age-4-release-date-trailer-gameplay-news/

It's unknown what the Crucious Stone does but, as Solas is after it, it can be assumed it's essential to his plot to bring down the Veil and could possibly play a role in Dragon Age: Dreadwolf.

Source: https://gamerant.com/dragon-age-dreadwolf-the-missing-comic-narrative-solas/