Is there a list of which features were added to specific releases (versions) of Bash?

Here are some links to official Bash documentation:

A more extensive, partial list than the one below can be found at http://wiki.bash-hackers.org/scripting/bashchanges

Here's a partial list of the changes, in a more compact format:

Feature

Added in version

read -N

4.1-alpha

associative arrays

4.0-alpha

&>> and |&

4.0-alpha

coproc

4.0-alpha

globstar

4.0-alpha

mapfile/readarray

4.0-alpha

x+=string

3.1-alpha1

printf -v var

3.1-alpha1

{x..y}

3.0-alpha

${!array[@]}

3.0-alpha

[[ =~

3.0-alpha

<<<

2.05b-alpha1

i++

2.04-devel

for ((;;))

2.04-devel

/dev/fd/N, /dev/tcp/host/port, etc.

2.04-devel

a=(*.txt) file expansion

2.03-alpha

extglob

2.02-alpha1

[[

2.02-alpha1

builtin printf

2.02-alpha1

$(< filename)

2.02-alpha1

** (exponentiation)

2.02-alpha1

\xNNN

2.02-alpha1

(( ))

2.0-beta2