TiddlyWiki is under rapid development at the moment as it moves through beta to a full release.
During the beta TiddlyWiki will be practical for cautious everyday use but as we perfect the product there will occasionally be situations where we have to make changes that are not backwards compatible. These occasions will be clearly marked in the release notes.
The following additional features are planned or under consideration for implementation during the beta:
[img[url]]for remote image embedding, and
[ext[url]]for explicit external links
TiddlyWiki will leave beta and become a full release in the first half of 2014. That is the point at which it is declared stable enough for general use. It will continue to improve and evolve after this point, although constrained to remain backwards compatible so that plugins and content created for version 5.0 will continue to work into the indefinite future.