Thank you for the suggestion! It's in version 7.0, which is now out on Android, iPhone and the web.
When you open a verse in the editor, its word count now shows below the passage, e.g. "45 words". It updates as you type or paste, so it also helps while you put a new card together. It's placed in the editor rather than on the flashcard, so the card stays free for recalling the verse.
The number is what remembering the card adds to your score for the day. Verse numbers in square brackets, like [16], don't count, and neither do formatting characters. There's more in the help pages: https://www.remem.me/docs/verses/#word-count
You also mentioned other statistics. Which numbers would you like to see for a card, and what would you use them for? That would help to understand what's missing.