Images now default to no floating. Our standard way to include an image within a card is to include an actual image card, and you can add css style specifications to the inclusions syntax. If you want it to float to the right, for example, you can do the following:
{{image_cardname|float:right}}
You can also do things like borders this way. Moreover, you can use this same technique on any other kinds of included card, to set fonts, for example. (Cool how this separates form and content!)