Dialog conducted a poll that was taken out for Haaretz and was released on Feb 25 2015.

Current Knesset seats in [brackets]

23 [20] Zionist Union (Labor-Livni)
23 [18] Likud
12 [20] Yesh Atid
12 [11] Bayit Yehudi
12 [11] The Joint (Arab) List
09 [02] Koolanu (Kahlon+Kadima)
07 [10] Shas
07 [07] Yahadut Hatorah/UTJ
06 [13] Yisrael Beitenu
05 [06] Meretz
04 [02] Yachad (Yishai+Chetboun+Marzel)

68 [63] Right-Religious-Kahlon (Parties that have not ruled out nominating Netanyahu in Phase 2)
52 [57] Center-Left-Arab (Parties that have ruled out nominating Netanyahu in Phase 2)

Interesting additional question that I will add:

Number of undecided voters (Largest Party that they are leaning towards)

1 – Yachad 49% (15% Shas,15% UTJ)
2 – Zionist Union 43% (17% Yesh Atid)
3 – The Joint List 40% (40% Meretz)
4 – Shas 38% (11% Yachad)
5 – Likud 36% (17% Bayit Yehudi)
6 – Yesh Atid 36% (14% Zionist Union)
7 – Bayit Yehudi 34% (17% Likud)
8 – Koolanu 29% (10% Yesh Atid)
9 – Yisrael Beitenu 29% (10% Koolanu)
10 – Meretz 26% (19% Zionist Union)
11 – UTJ 15% (7% Yachad)

Quick Take: Interesting that half of Yachad voters have not finalized their vote. Important to note that Likud voters are more locked in than Zionist Union voters.