I downloaded the http://archive-3.kali.org/kali/dists/kali/main/binary-amd64/Packages.gz file, unzipped it, then searched for postgres-9.4. I couldn't find it, but I can see it in http://archive-3.kali.org/kali/pool/main/p/postgresql-9.4/postgresql-9.4_9.4.0-1_amd64.deb. I am looking to install postgres-9.4, but it's not available in the repository.
root@FullyArmored:Downloads# aptitude show postgresql-9.1
Package: postgresql-9.1
State: installed
Automatically installed: yes
Version: 9.1.15-0+deb7u1
Priority: optional
Section: database
Maintainer: Debian PostgreSQL Maintainers [email protected]
Architecture: amd64
Uncompressed Size: 17.1 M
Depends: libc6 (>= 2.11), libcomerr2 (>= 1.01), libgssapi-krb5-2 (>= 1.8+dfsg),
libkrb5-3 (>= 1.6.dfsg.2), libldap-2.4-2 (>= 2.4.7), libpam0g (>=
0.99.7.1), libpq5 (>= 9.1~), libssl1.0.0 (>= 1.0.0), libxml2 (>=
2.7.4), postgresql-client-9.1, postgresql-common (>= 115~), tzdata,
ssl-cert, locales
Suggests: oidentd | ident-server, locales-all
Conflicts: postgresql (< 7.5), postgresql (< 7.5), postgresql-9.1
Breaks: postgresql-plpython-9.1 (< 9.1.15-0+deb7u1), postgresql-plpython-9.1 (<
9.1.15-0+deb7u1)
Replaces: postgresql-contrib-9.1 (< 9.1~beta1-3~), postgresql-contrib-9.1 (<
9.1~beta1-3~), postgresql-plpython-9.1 (< 9.1.15-0+deb7u1),
postgresql-plpython-9.1 (< 9.1.15-0+deb7u1)
Description: object-relational SQL database, version 9.1 server

Homepage: http://www.postgresql.org/

Tags: devel::lang:sql, implemented-in::c, interface::daemon, network::server,
network::service, protocol::db:psql, protocol::ssl, role::program,
scope::application, suite::postgresql, use::storing, works-with::db

root@FullyArmored:Downloads# aptitude show postgresql-9.4
E: Unable to locate package postgresql-9.4
root@FullyArmored:Downloads# lsb_release -a
No LSB modules are available.
Distributor ID: Kali
Description: Kali GNU/Linux 1.1.0
Release: 1.1.0
Codename: moto
root@FullyArmored:Downloads# cat /etc/apt/sources.list

deb cdrom:[Debian GNU/Linux 7.0 Kali - Official Snapshot amd64 LIVE/INSTALL Binary 20130905-07:57]/ kali contrib main non-free

#deb cdrom:[Debian GNU/Linux 7.0 Kali - Official Snapshot amd64 LIVE/INSTALL Binary 20130905-07:57]/ kali contrib main non-free

deb http://http.kali.org/kali kali main non-free contrib
deb-src http://http.kali.org/kali kali main non-free contrib

Security updates

deb http://security.kali.org/kali-security kali/updates main contrib non-free