To the writing of commentaries there is not end.
There are so many commentaries on almost any book of the Bible today that one might as well give up trying to keep up with the field. It gets even worse if you pay more than lip service to working in several languages. For example, not counting commentaries in English, three pretty hefty commentaries came out recently on Luke: Bovon’s last volume of his four volume commentary; Michael Wolter’s volume published by Mohr-Siebeck; Heins Klein’s commentary published by Vandenhoeck, to name only these three.
My present research work is spread mainly over three areas.